#logo{
    height: 50px;
    background-color: blue;
}

#menu{
    height: 80px;
}
.menu-item{
    height: 60px;
    width: 100px;
    background-color: rgb(234, 231, 231);
    /* 改变div的浮动方式，放到一行上面 */
    float: left;
    margin-left: 10px;
    margin-top: 10px;
    padding-left: 20px;
    padding-top: 10px;
}
.menu-item:hover{
    background-color: rgb(89, 88, 88);
}

#body{
    height: 500px;
}
.show{
    height: 400px;
    width: 200px;
    /* border: 2px double black; */
    border-width: 2px;
    border-style: dotted;
    border-color: black;
    border-radius: 20%;
    float: left;
}


